Engine oil VALVOLINE or Shell

I have been using various Valvoline synthetic oils 10+ years in multiple stationary engines, tractors, diesel and petrol engines. No sludge, no varnish inside the engines, and never worn an engine out.

I am using 15W40 Shell Oil for the last 8 years. No issues. 160k Kms on the Odometer

I use Valvoline restore and protect. It fixed the tick after a few oil changes

I have always used shell 10w-40 and did regular oil changes around 4-4.5k. Faced no issues what so ever, engine was still healthy, no oil consumption, almost same performance.

5W30 Valvoline Restore and Protect is good

Valvoline Restore & Protect is reportedly great.

I run Valvoline restore & protect because 2x 5 qt jugs fits my 4 qt Prius and 6 qt Maverick perfectly and I run it on the Prius which has stopped oil burning from the low tension rings.

I run rotella T6 5w-40. Have for 120k miles and will for the next 120k

I went to Valvoline once, oil pan emptied itself onto their floors the moment I started the engine. Joking aside I think it's perfectly fine to go to Valvoline, I go there often bringing my own oil and filter, that way I know it's the right oil and it's good quality stuff.

I do believe that Valvoline R and R can cause oil leaks. I have noticed that in a couple of cars.